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What is the main function of Oplog?

What is the main function of Oplog?
A . A persistent write buffer to coalesce bursts of random writes before destaging to the extend store
B . A memory cache to coalesce all writes before destaging to the extent store
C . A persistent write buffer to coalesce all writes before destaging to the extent store
D . A memory cache to coalesce bursts of random writes before destaging to the extent store

Answer: A

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